Two bizarre cases happened in a small town in the southwest. The policewoman Lin Yuhong played by Jiang Qinqin overcame many difficulties and solved the cases. In the case that seemed to have a clear motive for the crime, a series of unknown secrets were revealed, which made the case fall into the fog again. These stories closely implicate the past, present and future of the small town. The love, hatred and sin that run through the long river of time will eventually disappear, but the river flows eastward, day and night.